From cf7acca66fd02d2d82d044cf50c2b8d68def49d8 Mon Sep 17 00:00:00 2001
From: Ben Alman <cowboy@rj3.net>
Date: Thu, 6 Mar 2014 12:34:01 -0500
Subject: [PATCH] Add expandMapping .extDot option. Closes gh-979.

* Can be 'first' or 'last' but defaults to 'first'.
---
 lib/grunt/file.js       | 10 +++++++++-
 test/grunt/file_test.js | 22 ++++++++++++++++++++++
 2 files changed, 31 insertions(+), 1 deletion(-)

diff --git a/lib/grunt/file.js b/lib/grunt/file.js
index dd486410b..1abbebf89 100644
--- a/lib/grunt/file.js
+++ b/lib/grunt/file.js
@@ -133,9 +133,17 @@ file.expand = function() {
 
 var pathSeparatorRe = /[\/\\]/g;
 
+// The "ext" option refers to either everything after the first dot (default)
+// or everything after the last dot.
+var extDotRe = {
+  first: /(\.[^\/]*)?$/,
+  last: /(\.[^\/\.]*)?$/,
+};
+
 // Build a multi task "files" object dynamically.
 file.expandMapping = function(patterns, destBase, options) {
   options = grunt.util._.defaults({}, options, {
+    extDot: 'first',
     rename: function(destBase, destPath) {
       return path.join(destBase || '', destPath);
     }
@@ -151,7 +159,7 @@ file.expandMapping = function(patterns, destBase, options) {
     }
     // Change the extension?
     if (options.ext) {
-      destPath = destPath.replace(/(\.[^\/]*)?$/, options.ext);
+      destPath = destPath.replace(extDotRe[options.extDot], options.ext);
     }
     // Generate destination filename.
     var dest = options.rename(destBase, destPath, options);
diff --git a/test/grunt/file_test.js b/test/grunt/file_test.js
index b72a62a66..27493191f 100644
--- a/test/grunt/file_test.js
+++ b/test/grunt/file_test.js
@@ -290,6 +290,28 @@ exports['file.expandMapping'] = {
     test.deepEqual(actual, expected, 'specified extension should be added');
     test.done();
   },
+  'extDot': function(test) {
+    test.expect(2);
+    var actual, expected;
+
+    actual = grunt.file.expandMapping(['expand-mapping-ext/**/file*'], 'dest', {ext: '.foo', extDot: 'first'});
+    expected = [
+      {dest: 'dest/expand-mapping-ext/dir.ectory/file-no-extension.foo', src: ['expand-mapping-ext/dir.ectory/file-no-extension']},
+      {dest: 'dest/expand-mapping-ext/dir.ectory/sub.dir.ectory/file.foo', src: ['expand-mapping-ext/dir.ectory/sub.dir.ectory/file.ext.ension']},
+      {dest: 'dest/expand-mapping-ext/file.foo', src: ['expand-mapping-ext/file.ext.ension']},
+    ];
+    test.deepEqual(actual, expected, 'extDot of "first" should replace everything after the first dot in the filename.');
+
+    actual = grunt.file.expandMapping(['expand-mapping-ext/**/file*'], 'dest', {ext: '.foo', extDot: 'last'});
+    expected = [
+      {dest: 'dest/expand-mapping-ext/dir.ectory/file-no-extension.foo', src: ['expand-mapping-ext/dir.ectory/file-no-extension']},
+      {dest: 'dest/expand-mapping-ext/dir.ectory/sub.dir.ectory/file.ext.foo', src: ['expand-mapping-ext/dir.ectory/sub.dir.ectory/file.ext.ension']},
+      {dest: 'dest/expand-mapping-ext/file.ext.foo', src: ['expand-mapping-ext/file.ext.ension']},
+    ];
+    test.deepEqual(actual, expected, 'extDot of "last" should replace everything after the last dot in the filename.');
+
+    test.done();
+  },
   'cwd': function(test) {
     test.expect(1);
     var actual = grunt.file.expandMapping(['**/*.txt'], 'dest', {cwd: 'expand'});